Method for comprehensively recycling lead and zinc containing blast furnace dust

A dust and blast furnace technology, which is applied in the field of comprehensive recycling of blast furnace dust containing lead and zinc, can solve problems such as sinter composition segregation, leaching agent consumption, and unit operations

Active Publication Date: 2016-04-13
红河钢铁有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method is mainly to dry or wet separate the dust through flotation, gravity, magnetic separation and other beneficiation methods, or use hydrocyclone technology to carry out wet classification according to particle size. The main purpose is to obtain qualified iron concentrate, basically no Considering the utilization of lead and zinc, and most of the physical methods include flotation carbon removal process, a large amount of water consumption and subsequent treatment in the flotation process is a problem, and there are also great disadvantages, and the dust in the dust A part of zinc exists in the form of zinc ferrite composite oxide, which makes the zinc content in the iron concentrate after separation mostly exceed the standard. Due to this difficult problem, many researches in this field at home and abroad are at a standstill
The wet process is mainly used by foreign iron and steel enterprises to deal with high-zinc dust with a zinc content greater than 15%, but there are still low zinc and lead leaching rates, and the leaching slag is difficult to be recycled as raw materials for steel plants, and it cannot meet the requirements of the Environmental Protection Law. stacking requirements; and there are generally too many unit operations, the consumption of leaching agents is high, and the cost is high; the equipment is severely corroded. Most of the operating conditions are relatively harsh; they are sensitive to raw materials, making it difficult to optimize the process; sul

Method used

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  • Method for comprehensively recycling lead and zinc containing blast furnace dust
  • Method for comprehensively recycling lead and zinc containing blast furnace dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 and 2 As shown, take the blast furnace bag dust removal powder containing lead and zinc dust with a TFe content of 25.2%, a Zn content of 12.74%, a Pb content of 4.06%, and a C content of 37.24%, and comprehensively recycle and utilize it through the following steps:

[0030] 1. Mix the above recovered blast furnace lead-zinc dust and coke powder with a fineness of 50 mesh and a fixed carbon content of 83% with water at a weight ratio of 10:1.5 to make pellets;

[0031] 2. Add the above-mentioned pellets from the kiln tail at a rate of 40-300 tons / h with an inclination angle of 3.5°, a rotation speed of 0.3-4m / min, and an outlet gas flow rate of 50-450m 3 / s Φ3.0×60 rotary kiln, and spray gas from the kiln head to heat the pellets. The pellets enter the drying and preheating section (650~750℃) through the continuous rotation of the rotary kiln, and then enter the medium temperature section (750℃) ~1100℃), and finally enter the high-temperature section ...

Embodiment 2

[0037] Take the lead-zinc dust of the blast furnace bag dust removal powder with a TFe content of 39.57%, a Zn content of 15.81%, a Pb content of 2.12%, and a C content of 26.74%, and comprehensively recycle through the following steps:

[0038] 1. Mix the above recovered blast furnace dust containing lead and zinc with coal powder with a fineness of 200 mesh and a fixed carbon content of 45% by adding water at a weight ratio of 10:3 to make pellets;

[0039] 2. Put the above-mentioned pellets into the rotary kiln from the kiln tail, and spray propane from the kiln head to heat the pellets. The pellets enter the drying and preheating section (600-700°C) through the continuous rotation of the rotary kiln, and then enter the middle temperature section (700-850°C), and finally enter the high-temperature section (900-1000°C) for smelting for 50 minutes; with the rotation of the rotary kiln, the lead, zinc and some alkali metal oxides and sulfides in the pellets in the high-temperat...

Embodiment 3

[0045] Take the blast furnace bag dust removal powder containing lead and zinc dust with a TFe content of 20.23%, a Zn content of 16.93%, a Pb content of 3.68%, and a C content of 54.39%, and comprehensively recycle through the following steps:

[0046] 1. Mix the above recovered blast furnace lead-zinc dust and coal powder with a fineness of 120 mesh and a fixed carbon content of 78% with water at a weight ratio of 10:2 to make pellets;

[0047] 2. Put the above-mentioned pellets into the rotary kiln from the kiln tail, and spray natural gas from the kiln head to heat the pellets. The pellets enter the drying and preheating section (600-700°C) through the continuous rotation of the rotary kiln, and then enter the middle temperature section (700-950°C), and finally enter the high-temperature section (950-1100°C) for smelting for 45 minutes; as the rotary kiln rotates, the lead, zinc and some alkali metal oxides and sulfides in the pellets in the high-temperature section are red...

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Abstract

The invention discloses a method for comprehensively recycling lead and zinc containing blast furnace dust and belongs to the technical field of iron and steel smelting. The method comprises the following steps: the step of batching: evenly mixing reclaimed lead and zinc containing blast furnace dust and a carbon powder agent according to the weight ratio of 10 to 1-3 to prepare pellets; the step of removing lead and zinc at a high temperature: adding the pellets into a rotary kiln from a kiln tail, spraying fuel from a kiln head to heat the pellets to reach the temperature of 900 to 1300 DEG C and smelting for 30 to 50 min, after smelting, discharging an obtained lead and zinc removed iron containing material from the kiln head and cooling to reach a normal temperature, and discharging dust and gas from the kiln tail; the step of lead and zinc dust recycling: collecting and sending the gas and the dust discharged from the kiln tail of the rotary kiln into a cyclone dust collector to obtain lead and zinc containing dust through catching, and externally discharging residual smoke; and the step of magnetic separation of an iron containing material: carrying out magnetic separation on the lead and zinc removed iron containing material so as to obtain iron ore concentrate and tailings. The method provided by the invention is characterized in that the process is simple, more than 90 percent of lead and zinc in the lead and zinc containing blast furnace dust can be effectively removed, iron containing dust, lead and zinc can be comprehensively recycled, and energy conservation and emission reduction can be achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and specifically relates to a method for comprehensively recycling blast furnace lead-zinc-containing dust with simple process, high removal rate of lead and zinc in dust, high resource utilization rate, energy saving and emission reduction. Background technique [0002] Blast furnace dust containing lead and zinc is also commonly known as blast furnace ash or blast furnace gas ash. Generally speaking, the output of dust in iron and steel enterprises is 8-12% of steel output, the mass fraction of iron in furnace dust is 30-45%, and the mass fraction of carbon is 10%. ~40%. Since the dust produced by blast furnaces using ores with high zinc and lead content contains a certain proportion of lead and zinc elements, it can be well applied to ordinary blast furnace dust for sintering, but the use of dust with high lead and zinc content is more troublesome. , and the problem is becomin...

Claims

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Application Information

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IPC IPC(8): C22B1/248C22B1/02C22B19/30C22B13/02C22B26/10
CPCC22B1/02C22B1/2406C22B1/248C22B13/025C22B19/30C22B26/10Y02P10/20
Inventor 周晓雷王洁高勇
Owner 红河钢铁有限公司
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